Kevin Enderby 527d783837 Tweak the MCExternalSymbolizer to not use the SymbolLookUp() call back ...

to not guess at a symbol name in some cases.

The problem is that in object files assembled starting at address 0, when
trying to symbolicate something that starts like this:

% cat x.s
_t1:
	vpshufd	$0x0, %xmm1, %xmm0

the symbolic disassembly can end up like this:

% otool -tV x.o 
x.o:
(__TEXT,__text) section
_t1:
0000000000000000	vpshufd	$_t1, %xmm1, %xmm0

Which is in this case produced incorrect symbolication.

But it is useful in some cases to use the SymbolLookUp() call back
to guess at some immediate values.  For example one like this
that does not have an external relocation entry:

% cat y.s
_t1:
	movl	$_d1, %eax
.data
_d1:	.long	0

% clang -c -arch i386 y.s

% otool -tV y.o 
y.o:
(__TEXT,__text) section
_t1:
0000000000000000	movl	$_d1, %eax

% otool -rv y.o 
y.o:
Relocation information (__TEXT,__text) 1 entries
address  pcrel length extern type    scattered symbolnum/value
00000001 False long   False  VANILLA False     2 (__DATA,__data)

So the change is based on it is not likely that an immediate Value
coming from an instruction field of a width of 1 byte, other than branches
and items with relocation, are not likely symbol addresses.

With the change the first case above simply becomes:

% otool -tV x.o 
x.o:
(__TEXT,__text) section
_t1:
0000000000000000	vpshufd	$0x0, %xmm1, %xmm0

and the second case continues to work as expected.

rdar://14863405


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199698 91177308-0d34-0410-b5e6-96231b3b80d8

2014-01-21 00:23:17 +00:00

..

MCDisassembler

For the 'C' disassembler API, add a new ReferenceType for the

2014-01-06 22:08:08 +00:00

MCParser

Fix parsing of .symver directive on ARM

2014-01-15 22:40:02 +00:00

CMakeLists.txt

Add a MCAsmInfoELF class and factor some code into it.

2013-10-16 01:34:32 +00:00

ELFObjectWriter.cpp

Force emit a relocation for @gnu_indirect_function symbols so that the indirect

2014-01-08 18:50:32 +00:00

LLVMBuild.txt

LLVMBuild: Introduce a common section which currently has a list of the

2011-12-12 22:45:54 +00:00

MachObjectWriter.cpp

Correct word hyphenations

2013-12-05 05:44:44 +00:00

Makefile

…

MCAsmBackend.cpp

Use llvm::array_lengthof to replace sizeof(array)/sizeof(array[0]).

2013-07-15 04:27:47 +00:00

MCAsmInfo.cpp

CommentColumn is always 40. Simplify.

2014-01-16 07:04:11 +00:00

MCAsmInfoCOFF.cpp

Make the llvm mangler depend only on DataLayout.

2014-01-03 19:21:54 +00:00

MCAsmInfoDarwin.cpp

Make the llvm mangler depend only on DataLayout.

2014-01-03 19:21:54 +00:00

MCAsmInfoELF.cpp

Refactor the setting of PrivateGlobalPrefix.

2013-12-02 23:39:26 +00:00

MCAsmStreamer.cpp

Add an emitRawComment function and use it to simplify some uses of EmitRawText.

2014-01-16 16:28:37 +00:00

MCAssembler.cpp

Fix indentation.

2014-01-13 15:50:36 +00:00

MCAtom.cpp

[weak vtables] Remove a bunch of weak vtables

2013-11-19 00:57:56 +00:00

MCCodeEmitter.cpp

…

MCCodeGenInfo.cpp

Sink codegen optimization level into MCCodeGenInfo along side relocation model

2011-11-16 08:38:26 +00:00

MCContext.cpp

Re-sort all of the includes with ./utils/sort_includes.py so that

2014-01-07 11:48:04 +00:00

MCDisassembler.cpp

Follow up of the introduction of MCSymbolizer.

2013-05-24 22:51:52 +00:00

MCDwarf.cpp

[patch] Adjust behavior of FDE cross-section relocs for targets that don't support abs-differences.

2014-01-08 10:22:54 +00:00

MCELF.cpp

[mc] Fix ELF st_other flag.

2013-12-05 00:34:11 +00:00

MCELFObjectTargetWriter.cpp

Provide basic type safety for array_pod_sort comparators.

2013-09-22 14:09:50 +00:00

MCELFStreamer.cpp

Re-sort all of the includes with ./utils/sort_includes.py so that

2014-01-07 11:48:04 +00:00

MCExpr.cpp

ARM: add tlsldo relocation

2014-01-20 11:00:40 +00:00

MCExternalSymbolizer.cpp

Tweak the MCExternalSymbolizer to not use the SymbolLookUp() call back

2014-01-21 00:23:17 +00:00

MCFunction.cpp

Style cleanup following David's review for r188876.

2013-08-21 19:40:25 +00:00

MCInst.cpp

Release build: guard dump functions with

2012-09-12 05:06:18 +00:00

MCInstPrinter.cpp

[MC] When MCInstPrint::printAnnotation uses a comment stream, it has to ensure

2013-10-01 19:21:24 +00:00

MCInstrAnalysis.cpp

MC: Disassembled CFG reconstruction.

2013-05-24 01:07:04 +00:00

MCLabel.cpp

Release build: guard dump functions with

2012-09-12 05:06:18 +00:00

MCMachObjectTargetWriter.cpp

…

MCMachOStreamer.cpp

Move .ident handling to MCStreamer.

2013-10-16 01:05:45 +00:00

MCModule.cpp

MC CFG: Split MCBasicBlocks to mirror atom splitting.

2013-08-21 07:28:24 +00:00

MCModuleYAML.cpp

MC CFG: Add YAML MCModule representation to enable MC CFG testing.

2013-08-21 07:29:02 +00:00

MCNullStreamer.cpp

Add a MCTargetStreamer interface.

2013-10-08 13:08:17 +00:00

MCObjectDisassembler.cpp

Create an atom with just the data that failed to disassemble.

2013-10-16 19:03:14 +00:00

MCObjectFileInfo.cpp

Revert "Revert r198851, "Prototype of skeleton type units for fission""

2014-01-10 01:38:41 +00:00

MCObjectStreamer.cpp

Re-sort all of the includes with ./utils/sort_includes.py so that

2014-01-07 11:48:04 +00:00

MCObjectSymbolizer.cpp

Re-sort all of the includes with ./utils/sort_includes.py so that

2014-01-07 11:48:04 +00:00

MCObjectWriter.cpp

Move [SU]LEB128 encoding to a utility header.

2012-08-08 23:56:06 +00:00

MCPureStreamer.cpp

Move .ident handling to MCStreamer.

2013-10-16 01:05:45 +00:00

MCRegisterInfo.cpp

Make SubRegIndex size mandatory, following r183020.

2013-05-31 23:45:26 +00:00

MCRelocationInfo.cpp

Re-sort all of the includes with ./utils/sort_includes.py so that

2014-01-07 11:48:04 +00:00

MCSection.cpp

Use the new script to sort the includes of every file under lib.

2012-12-03 16:50:05 +00:00

MCSectionCOFF.cpp

MC COFF: Emit the 'b' section flag for .bss sections in GNU assembly

2013-12-17 22:12:40 +00:00

MCSectionELF.cpp

Remove AllowQuotesInName and friends from MCAsmInfo.

2013-11-13 14:01:59 +00:00

MCSectionMachO.cpp

Correct word hyphenations

2013-12-05 05:44:44 +00:00

MCStreamer.cpp

Add an emitRawComment function and use it to simplify some uses of EmitRawText.

2014-01-16 16:28:37 +00:00

MCSubtargetInfo.cpp

MC: Don't assume incoming StringRef's are null terminated.

2013-10-13 22:09:26 +00:00

MCSymbol.cpp

Don't mangle \n and "

2013-11-14 06:05:49 +00:00

MCSymbolizer.cpp

Add MCSymbolizer for symbolic/annotated disassembly.

2013-05-24 00:39:57 +00:00

MCValue.cpp

Release build: guard dump functions with

2012-09-12 05:06:18 +00:00

MCWin64EH.cpp

Fix alignment of unwind data.

2013-09-15 18:01:09 +00:00

SubtargetFeature.cpp

MC: Don't assume incoming StringRef's are null terminated.

2013-10-13 22:09:26 +00:00

WinCOFFObjectWriter.cpp

MC: Fatally error if subtraction operand is bad

2014-01-06 07:39:46 +00:00

WinCOFFStreamer.cpp

clang-format a couple of mis-formatted functions

2013-12-20 20:16:51 +00:00